Draft:Duburg

Duburg Castle is a burgstall hill castle on Marienburg hill in Flensburg.

Name
The earliest records of the castle refer to it with the name of the hill, Marienburg. The name Duburg is believed to have come from the Danish Dueborgen (Due Castle), after the knight Jens Due. Another theory for the name Duburg comes from the Low German Duwenburch, meaning Pigeon Castle. This pigeon connection is corroborated in a 1649 High German document which refered to the castle as "Taubenburg", Pigeon Castle. In Danish and Norwegian, the castle is also known as Duborg or Dueborch. Duburg Castle gave the Duburg statistical area of Flensburg its name.

Construction and Disputes of Ownership
Before the building of Duburg Castle, Marienberg hill was home to the Edelhof on the Flenstoft farm. The Edelhof and Flenstoft farm were acquired by Margaret I of Denmark in 1409 as a concession from the House of Schaumburg. Construction of the castle began in 1411, and the ownership of the castle by the queen was finalized in the city record on October 25, 1412. The House of Schaumburg took over the city of Flensburg in 1412, however they were unable to conquer the castle then ruled by Eric VII and were forced to retreat. In November of 1422 the House of Shaumberg again unsuccessfully attempted to re-take the castle, lead by Henry IV, Count of Holstein-Rendsburg, and in 1427 the House of Shaumberg joined the Hanseatic League in the Dano-Hanseatic War against the Kalmar Union, which failed after the supplies of the invading forces ran out.